CN107029523B - Foam washer - Google Patents

Foam washer Download PDF

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Publication number
CN107029523B
CN107029523B CN201710445552.7A CN201710445552A CN107029523B CN 107029523 B CN107029523 B CN 107029523B CN 201710445552 A CN201710445552 A CN 201710445552A CN 107029523 B CN107029523 B CN 107029523B
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conical coil
communicating valve
pipe
washing
water tank
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CN107029523A (en
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易争明
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Xiangtan University
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Xiangtan University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1406—Multiple stage absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/04—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour through foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06—Spray cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/12—Washers with plural different washing sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1481—Removing sulfur dioxide or sulfur trioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention discloses a foam scrubber. The foam washer comprises a washing tower, a washing pipe communicated with the washing tower, a circulating water tank communicated with the bottom of the washing tower, a first spraying device connected with the circulating water tank and used for spraying flue gas in the washing pipe, and a second spraying device used for spraying flue gas in the washing tower, wherein the first spraying device comprises a first spray head arranged in the washing pipe; the foam scrubber also comprises a first conical coil pipe which is arranged in the washing pipe and filled with heat exchange media, and the first conical coil pipe and the first spray head are arranged at intervals relatively along the airflow flowing direction. The invention also provides a foam scrubber which can effectively improve SO in waste gas2And the like, and has good dust removal and waste gas purification effects.

Description

Foam washer
Technical Field
The invention relates to the technical field of chemical tail gas treatment, in particular to a foam scrubber.
Background
SO in the atmosphere2Can form sulfuric acid mist and sulfuric acid rain, and easily form sulfuric acid mist when the humidity is high, the temperature is low and particulate matters exist, so that the haze weather is increased, and the harm is caused to the human health. For this reason, the state has been in much policy and regulation to control SO2The amount of discharge of (c). For example, the flue gas emission standard SO is regulated in the national standard GB 16297-19962≤960mg/m3In the current severe environmental situation, GB 31570-2015 "emission standard for industrial pollutants for petroleum refining" requires that the current enterprise execute from 2017 to 7/1: flue gas emission standard SO of acid gas recovery device2≤400mg/m3And SO is required for special areas2≤100mg/m3。
At present, at home and abroad, the flue gas desulfurization is divided into dry desulfurization and wet desulfurization, wherein the dry desulfurization adopts powdery or granular absorbent or catalyst, and the wet desulfurization adopts absorption liquid such as water, alkaline solution and the like to remove SO contained in the waste gas2And the like. At present, wet desulphurization is widely applied, gas and liquid are mainly fully contacted, the collision probability of absorption liquid and pollutants is increased, and the desulphurization efficiency of equipment is improved. A common wet desulfurization apparatus has: spray towers, venturi scrubbers, tray (packed) towers, and the like.
The plate type (filler) tower is composed of tower plates, fillers, distributors and other materials, and compared with other washing towers, the fillers are easy to block, the equipment investment is large, and the economy is not realized;
the spray tower is a traditional wet desulphurization device, and the main factors influencing the spray efficiency are the uniformity of liquid drop distribution, the liquid drop particle size and the particle size distribution. Under the same spraying condition, the larger the particle size of the atomized liquid drops, the smaller the specific surface area of the atomized liquid drops, the lower the desulfurization efficiency, but the smaller the particle size of the liquid drops, the liquid drops are easy to vaporize or be taken away by air flow, and the desulfurization efficiency is directly influenced;
the venturi scrubber uses kinetic energy to form a single fluid nozzle of liquid drops, and flue gas enters the venturi scrubber after coming out of the air inlet pipeline and is in violent contact with liquid, so that impurities such as dust, oxysulfide and the like are removed, but when the flue gas pollutants fluctuate, the flow of the venturi scrubber does not have emergency adjustability, and meanwhile, the structure is complex, and the operation cost is higher.
Therefore, there is a need to provide a new process to solve the above technical problems.
Disclosure of Invention
The invention aims to overcome the technical problems and provide the foam scrubber which can effectively improve the removal efficiency and has good dust removal and waste gas purification effects.
The technical scheme of the invention is as follows:
a foam washer comprises a washing tower, a washing pipe communicated with the washing tower, a circulating water tank communicated with the bottom of the washing tower, a first spraying device connected with the circulating water tank and used for spraying flue gas in the washing pipe, and a second spraying device used for spraying flue gas in the washing tower, wherein the first spraying device comprises a first spray head arranged in the washing pipe; the foam scrubber also comprises a first conical coil pipe which is arranged in the washing pipe and filled with heat exchange media, and the first conical coil pipe and the first spray head are arranged at intervals relatively along the airflow flowing direction.
Preferably, the inlet and outlet ends of the first conical coil pipe are respectively connected with the circulating water tank.
Preferably, the second spraying device comprises a second nozzle arranged in the scrubber, the foam scrubber further comprises a second conical coil arranged in the scrubber and filled with a heat exchange medium, and the second conical coil and the second nozzle are arranged at intervals relatively along the airflow flowing direction.
Preferably, the inlet end of the second conical coil is connected with the exhaust port of the washing tower, and the outlet end of the second conical coil is communicated with the outside.
Preferably, the bubble scrubber further comprises a first circulation pipe, a second circulation pipe, a first communication valve, a second communication valve, a third communication valve, a fourth communication valve and a fifth communication valve, wherein,
one end of the first circulating pipeline is connected with the air outlet of the washing tower, the other end of the first circulating pipeline is connected with the inlet end of the first conical coil pipe, and the first communicating valve is arranged in the first circulating pipeline;
one end of the second circulating pipeline is connected with the outlet end of the first conical coil pipe, the other end of the second circulating pipeline is communicated with the outside, and the second communicating valve is arranged in the second circulating pipeline;
the third communicating valve is arranged on a pipeline connecting the circulating water tank and the inlet end of the first conical coil, the fourth communicating valve is arranged on a pipeline connecting the outlet end of the first conical coil and the circulating water tank, and the fifth communicating valve is arranged on a pipeline connecting the exhaust port of the washing tower and the inlet end of the second conical coil;
the first communicating valve, the second communicating valve, the third communicating valve and the fourth communicating valve are switched, and the heat exchange medium in the first conical coil is controlled to be switched; and switching the working state of the fifth communication valve to control the working state of the second conical coil.
Preferably, the inlet end of the first conical coil is connected with the gas outlet of the washing tower, and the outlet end of the first conical coil is communicated with the outside.
Preferably, the second spraying device comprises a second nozzle arranged in the scrubber, the foam scrubber further comprises a second conical coil arranged in the scrubber and filled with a heat exchange medium, and the second conical coil and the second nozzle are arranged at intervals relatively along the airflow flowing direction.
Preferably, the taper angle of the first conical coil pipe is 30-75 degrees, and the screw pitch is 50-70 mm.
Preferably, the taper angle of the second conical coil pipe is 30-75 degrees, and the thread pitch is 50-70 mm.
Preferably, the first spray head is a double-stage reverse spray.
Compared with the prior art, the foam washer provided by the invention has the beneficial effects that:
the foam scrubber comprises a washing pipe and a washing tower which are communicated, wherein a first conical coil filled with a heat exchange medium is arranged in the washing pipe, high-temperature flue gas enters from the top of the washing pipe, so that a gap of the first conical coil becomes an optimal place for gas-liquid direct contact and heat and mass transfer, and a gas-liquid two-phase flow forms a stable foam layer by depending on the first conical coil, so that the heat exchange efficiency of the gas-liquid two-phase and the removal efficiency of the foam scrubber are improved. Because the foam layer is built on the first conical coil, the physical strength, the surface tension, the foam layer height, the gas-liquid mass transfer area and the like of the foam layer are all stronger than those of the foam layer formed by the conventional dynamic wave assistant layer, and the removal effect is good.
And secondly, the first conical coil is arranged in the washing pipe, so that the quenching effect in the washing pipe is enhanced, when the high-temperature flue gas contains part of dust, the dust removal efficiency can be increased due to the quenching effect, and the dust removal and waste gas purification effects are improved.
And thirdly, the first conical coil pipe is arranged in the washing pipe, so that the upper surface and the lower surface of the first conical coil pipe can be simultaneously flushed by liquid flow sprayed by the first spray head and air flow from top to bottom respectively, no dead angle exists, and the washing pipe has a self-cleaning function.
Fourthly, work as heat transfer medium in the first conical coil is during absorption liquid in the circulating water tank, utilize untreated high temperature flue gas with heat transfer medium in the first conical coil carries out the heat transfer, makes absorption liquid in the circulating water tank heat to the lifting height that promotes waste gas from the normal atmospheric temperature, heat in the high temperature waste gas not only can be retrieved to first conical coil, and the energy can be saved can guarantee again normal work in the scrubbing tower reduces the consumption of absorbent, further improves the desorption efficiency of scrubber reduces secondary pollution.
Fifthly, a second conical coil is arranged in the washing tower, a heat exchange medium in the second conical coil is purified flue gas, and the absorption liquid sprayed by the second spray head exchanges heat with the purified gas, so that the heat value of the purified gas is improved, and the discharge speed of the purified gas is improved; the exhaust temperature reaches above the dew point, so that the corrosion to a flue and a chimney is reduced, and the diffusion degree of pollutants is improved; meanwhile, the temperature of the absorption liquid entering the circulating water tank is reduced, the spraying effect is ensured, the technical requirement on an anticorrosion process in the washing tower can be reduced, particularly when the foam washer is used for desulfurization and high-temperature flue gas treatment, an external flue gas heat exchange system in the traditional process can be saved, and the advantages of reducing equipment investment, reducing equipment floor area and the like are achieved.
Sixthly, the heat exchange medium in the first conical coil can adopt the absorption liquid in the circulating water tank, and can also adopt the purified flue gas discharged by the washing tower, and the parameters of the water temperature, the water level, the purified flue gas flow, the temperature and the like of the absorption liquid in the circulating water tank are monitored, so that the two heat exchange media are switched to be used, and the energy consumption can be saved.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of a foam scrubber according to the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of the foam scrubber of the present invention;
fig. 3 is a schematic structural diagram of a third embodiment of the foam scrubber provided by the present invention.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Example one
Fig. 1 is a schematic structural diagram of a foam scrubber according to a first embodiment of the present invention. The bubble scrubber 100 includes a washing pipe 11, a washing tower 12, a circulating water tank 13, a first spray device 14, a first conical coil 15, a second spray device 16, and a second conical coil 17. The washing pipe 11 is communicated with the washing tower 12, and the circulating water tank 13 is arranged at the bottom of the washing tower 12 and is communicated with the washing tower 12; the first spraying device 14 is connected with the circulating water tank 13 and is used for spraying the flue gas in the washing pipe 11; the first conical coil 15 is arranged in the washing pipe 11, and a heat exchange medium is filled in the first conical coil; the second spraying device 16 is connected with the circulating water tank 13 and is used for spraying the flue gas in the washing tower 12; the second conical coil 17 is disposed in the washing tower 12, and the inside thereof is filled with a heat exchange medium.
Specifically, splendid attire flue gas absorption liquid in the circulating water tank 13, first spray set 14 include first circulating pump 141 and with first shower nozzle 142 that first circulating pump 141's exit end is connected, first shower nozzle 142 is located in the wash pipe 11, first circulating pump 141 will absorption liquid pump in the circulating water tank 13 extremely in the wash pipe 11 for spray washing by the flue gas that wash pipe 11 top got into. The liquid phase sprayed by the first nozzle 142 and the gas phase in the washing pipe 11 flow in a counter-current manner, so that the heat exchange effect of the liquid phase and the gas phase is improved.
The inlet end of the first conical coil 15 is communicated with the circulating water tank 13, and the outlet end of the first conical coil is also communicated with the circulating water tank 13, so that the heat exchange medium in the first conical coil 15 is the flue gas absorption liquid in the circulating water tank 13. In practical application, the flue gas absorption liquid in the circulating water tank 13 is pumped into the first conical coil 15 by the medium conveying pump 18, and the flue gas is quenched and then flows back into the circulating water tank 13.
It should be noted that the inlet tube of the first conical coil tube 15 may be arranged on the upper conical surface thereof, and the corresponding outlet end of the first conical coil tube 15 is arranged on the lower conical surface thereof; it is also possible to design the inlet end of the first conical coil 15 to be arranged on its lower conical surface and the outlet end to be arranged on its upper conical surface. Preferably, the inlet end of the first conical coil 15 is arranged on the lower conical surface, and the outlet end of the first conical coil 15 is arranged on the upper end surface, so that the liquid-phase material flow in the first conical coil 15 and the gas-phase material flow entering the washing pipe 11 flow in the opposite directions, and the heat exchange effect of the liquid-phase material flow and the gas-phase material flow is improved.
The first conical coil 15 and the first nozzle 142 are arranged at intervals along the flowing direction of the airflow, and the first conical coil 15 is in an inverted cone shape. High-temperature flue gas enters from the top of the washing pipe, so that the gap of the first conical coil 15 becomes the best place for gas-liquid direct contact and heat and mass transfer, and gas-liquid two-phase flow depends on the first conical coil 15 to form a stable foam layer, thereby improving the heat exchange efficiency of gas-liquid two-phase and the removal efficiency of the foam washer. Because the foam layer is built on the first conical coil 15, the physical strength, the surface tension, the foam layer height, the gas-liquid mass transfer area and the like of the foam layer are all stronger than those of the foam layer formed by the conventional dynamic wave assistant layer, and the removal efficiency is good.
Preferably, the taper angle of the first conical coil 15 is 30-75 degrees, and the screw pitch is 50-70 mm, wherein the design value of the screw pitch is equivalent to the height of the foam layer in the washing pipe 11. The stability of the foam layer of the gas-liquid two-phase flow on the first conical coil 15 can be further improved by designing a reasonable taper angle and a reasonable pitch.
Meanwhile, the first conical coil 15 is arranged in the washing pipe 11, so that the quenching effect in the washing pipe 11 is enhanced, when the high-temperature flue gas contains part of dust, the dust removal efficiency can be increased due to the quenching effect, and the dust removal and waste gas purification effects are improved; the upper and lower surfaces of the first conical coil 15 are flushed by the liquid flow sprayed by the first nozzle and the air flow from top to bottom simultaneously, and no dead angle exists, so that the self-cleaning function is realized.
In this embodiment, heat transfer medium in the first conical coil 15 does during absorption liquid in the circulating water tank 13, utilize untreated high temperature flue gas with heat transfer medium in the first conical coil 15 carries out the heat transfer, makes absorption liquid in the circulating water tank 13 heat to the lifting height that promotes waste gas from the normal atmospheric temperature, heat in the high temperature waste gas not only can be retrieved to first conical coil 15, and the energy can be saved can guarantee again normal work in the scrubbing tower reduces the consumption of absorbent, further improves the desorption efficiency of scrubber reduces secondary pollution.
In this embodiment, the washing pipe 11 performs heat exchange by a primary reverse spraying method. Preferably, the washing pipes 11 perform heat exchange in a two-stage reverse spraying manner, wherein each stage of reverse spraying is formed by combining one first conical coil 15 and one group of first spraying nozzles 142, and each stage of reverse spraying device is arranged at intervals along the airflow direction.
In practical application, the heat exchange can be carried out in a multi-stage reverse spraying mode according to requirements.
The flue gas purified by the washing pipe 11 enters the washing tower 12, and is washed in the washing tower 12 for the second time.
The second spraying device 16 comprises a second water circulating pump 161 and a second spray nozzle 162 connected with the outlet end of the second water circulating pump 161, and the liquid phase material flow sprayed by the second spray nozzle 162 and the gas phase material flow entering the washing tower 12 flow in the reverse direction, so as to increase the heat exchange efficiency of the gas-liquid material flow phase.
The second conical coil 17 is disposed in the scrubber 12, and has an inlet end connected to the exhaust port of the scrubber 12 and an outlet end communicated with the outside. Namely, the flue gas purified in the washing tower 12 is used as the heat exchange medium in the second conical coil 17. The absorption liquid sprayed out by the second spray head 162 exchanges heat with the purified gas, so that the heat value of the purified gas is increased, and the discharge speed of the purified gas is increased; the exhaust temperature reaches above the dew point, so that the corrosion to a flue and smoke is reduced, and the diffusion degree of pollutants is improved; meanwhile, the temperature of the absorption liquid entering the circulating water tank 13 is reduced, the spraying effect is ensured, the technical requirements of the interior of the washing tower 12 on the corrosion prevention process can be reduced, particularly when the foam washer 100 is used for treating high-temperature flue gas of a desulfurizer, an external flue gas heat exchange system in the traditional process can be saved, and the advantages of reducing equipment investment and the like are achieved.
Preferably, the inlet end of the second conical coil 17 is arranged on the lower conical surface thereof, and the outlet end of the second conical coil 17 is arranged on the upper conical surface thereof, so that the airflow in the second conical coil 17 and the liquid sprayed by the second spray head 162 flow in the opposite direction, thereby improving the heat exchange effect.
The design parameters of the second conical coil 17 refer to the design of the first conical coil 15, the taper angle is 30-75 degrees, and the thread pitch is 50-70 mm.
Example two
Fig. 2 is a schematic structural diagram of a second embodiment of the foam scrubber according to the present invention. The bubble scrubber 200 is substantially the same as the bubble scrubber 100 of the first embodiment, except that the heat exchange medium in the first conical coil 25 is different.
Specifically, the inlet end of the first conical coil 25 is connected to the exhaust port of the scrubber 22, and the outlet end of the first conical coil 25 is connected to the outside. Namely, the heat exchange medium in the first conical coil 25 is the purified gas discharged from the scrubber 22.
In this embodiment, the technical effect of the first conical coil 25 is the same as that of the first embodiment. And the foam scrubber 200 has the advantages of few components, few input, low cost, and the like.
In the embodiment, the second conical coil is not arranged in the washing tower 22, but in order to further enhance the flue gas purification effect in the washing tower 22, the second conical coil having the same structure as that of the embodiment may be additionally arranged in the washing tower 22; and the heat exchange medium in the second conical coil is added to adopt the purified gas discharged from the washing tower 22, and the flue gas absorption liquid in the circulating water tank 23 can also be used.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a third embodiment of the foam scrubber according to the present invention. The bubble scrubber 300 is substantially the same as the bubble scrubber 100 of the first embodiment, except that the bubble scrubber 300 further comprises a switching device 39.
Specifically, the switching device 39 includes a first circulation conduit 391, a second circulation conduit 392, a first communicating valve 393, a second communicating valve 394, a third communicating valve 395, a fourth communicating valve 396 and a fifth communicating valve 397, wherein,
one end of the first circulating pipe 391 is connected to the gas outlet of the scrubber 32, and the other end is connected to the inlet end of the first conical coil 35, and the first connecting valve 393 is disposed in the first circulating pipe 391;
one end of the second circulation pipeline 392 is connected with the outlet end of the first conical coil 35, the other end of the second circulation pipeline is communicated with the outside, and the second communication valve 394 is arranged in the second circulation pipeline 392;
the third communicating valve 395 is provided in a pipe connecting the circulating water tank 33 and the inlet end of the first tapered coil 35, the fourth communicating valve 396 is provided in a pipe connecting the outlet end of the first tapered coil 35 and the circulating water tank 33, and the fifth communicating valve 397 is provided in a pipe connecting the exhaust port of the washing tower 32 and the inlet end of the second tapered coil 37. Switching of the heat exchange medium in the first conical coil 35 is controlled by switching the first communication valve 393, the second communication valve 394, the third communication valve 395, and the fourth communication valve 396; the operating state of the second conical coil 37 is controlled by switching the operating state of the fifth communication valve 397.
Specifically, when the heat exchange medium in the first conical coil 35 is the flue gas absorption liquid in the circulating water tank 33, the first communication valve 393 and the second communication valve 394 are closed, and the third communication valve 395, the fourth communication valve 396 and the fifth communication valve 397 are opened;
when the heat exchange medium in the first conical coil 35 is the purified gas of the washing tower 32, the first communication valve 393 and the second communication valve 394 are opened, and the third communication valve 395 and the fourth communication valve 396 are closed; the fifth communication valve 397 is selectively opened or closed according to parameters such as the amount of purified gas in the scrubber 32 and the amount of high-temperature flue gas in the scrubber 31, and the second conical coil 37 is controlled to operate or not operate by controlling the opening or closing of the fifth communication valve 397.
In this embodiment, the heat exchange medium in the first conical coil 35 may be the absorption liquid in the circulation water tank, or may be the purified flue gas discharged from the washing tower, and the parameters such as the water temperature, the water level, the purified flue gas flow rate, and the temperature of the absorption liquid in the circulation water tank are monitored, so that the two heat exchange media are switched to be used, and energy consumption can be saved; and the second conical coil 37 can be opened or closed according to specific conditions, so that the use is flexible.
It should be noted that the foam scrubbing tower provided by the invention is not only suitable for desulfurization, but also suitable for other high-temperature flue gas treatment.
Compared with the prior art, the foam washer provided by the invention has the beneficial effects that:
the foam scrubber comprises a washing pipe and a washing tower which are communicated, wherein a first conical coil filled with a heat exchange medium is arranged in the washing pipe, high-temperature flue gas enters from the top of the washing pipe, so that a gap of the first conical coil becomes an optimal place for gas-liquid direct contact and heat and mass transfer, and a gas-liquid two-phase flow forms a stable foam layer by depending on the first conical coil, so that the heat exchange efficiency of the gas-liquid two-phase and the removal efficiency of the foam scrubber are improved. Because the foam layer is built on the first conical coil, the physical strength, the surface tension, the foam layer height, the gas-liquid mass transfer area and the like of the foam layer are all stronger than those of the foam layer formed by the conventional dynamic wave assistant layer, and the removal effect is good.
And secondly, the first conical coil is arranged in the washing pipe, so that the quenching effect in the washing pipe is enhanced, when the high-temperature flue gas contains part of dust, the dust removal efficiency can be increased due to the quenching effect, and the dust removal and waste gas purification effects are improved.
And thirdly, the first conical coil pipe is arranged in the washing pipe, so that the upper surface and the lower surface of the first conical coil pipe can be simultaneously flushed by liquid flow sprayed by the first spray head and air flow from top to bottom respectively, no dead angle exists, and the washing pipe has a self-cleaning function.
Fourthly, work as heat transfer medium in the first conical coil is during absorption liquid in the circulating water tank, utilize untreated high temperature flue gas with heat transfer medium in the first conical coil carries out the heat transfer, makes absorption liquid in the circulating water tank heat to the lifting height that promotes waste gas from the normal atmospheric temperature, heat in the high temperature waste gas not only can be retrieved to first conical coil, and the energy can be saved can guarantee again normal work in the scrubbing tower reduces the consumption of absorbent, further improves the desorption efficiency of scrubber reduces secondary pollution.
Fifthly, a second conical coil is arranged in the washing tower, a heat exchange medium in the second conical coil is purified flue gas, and the absorption liquid sprayed by the second spray head exchanges heat with the purified gas, so that the heat value of the purified gas is improved, and the discharge speed of the purified gas is improved; the exhaust temperature reaches above the dew point, so that the corrosion to a flue and a chimney is reduced, and the diffusion degree of pollutants is improved; meanwhile, the temperature of the absorption liquid entering the circulating water tank is reduced, the spraying effect is ensured, the technical requirement on an anticorrosion process in the washing tower can be reduced, particularly when the foam washer is used for desulfurization and high-temperature flue gas treatment, an external flue gas heat exchange system in the traditional process can be saved, and the advantages of reducing equipment investment, reducing equipment floor area and the like are achieved.
Sixthly, the heat exchange medium in the first conical coil can adopt the absorption liquid in the circulating water tank, and can also adopt the purified flue gas discharged by the washing tower, and the parameters of the water temperature, the water level, the purified flue gas flow, the temperature and the like of the absorption liquid in the circulating water tank are monitored, so that the two heat exchange media are switched to be used, and the energy consumption can be saved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (4)

1. The utility model provides a foam scrubber, its characterized in that, including the scrubbing tower, with the washing pipe of scrubbing tower intercommunication, with the circulating water tank of scrubbing tower bottom intercommunication and with circulating water tank connects and is used for spraying the interior first spray set of flue gas of scrubbing tower, is used for spraying the interior second spray set of flue gas of scrubbing tower, locate in the scrubbing tower and pack the first conical coiled pipe that has heat transfer medium, locate in the scrubbing tower and pack second conical coiled pipe and the auto-change over device that has heat transfer medium, wherein:
the first spraying device comprises a first spray head arranged in the washing pipe;
the second spraying device comprises a second spray head arranged in the washing tower;
the first conical coil and the first spray head are arranged at intervals along the airflow flowing direction, and the inlet and outlet ends of the first conical coil are respectively connected with the circulating water tank;
the second conical coil and the second spray head are arranged at intervals relatively along the airflow flowing direction, the inlet end of the second conical coil is connected with the exhaust port of the washing tower, and the outlet end of the second conical coil is communicated with the outside;
the switching device comprises a first circulating pipeline, a second circulating pipeline, a first communicating valve, a second communicating valve, a third communicating valve, a fourth communicating valve and a fifth communicating valve,
one end of the first circulating pipeline is connected with the air outlet of the washing tower, the other end of the first circulating pipeline is connected with the inlet end of the first conical coil pipe, and the first communicating valve is arranged in the first circulating pipeline;
one end of the second circulating pipeline is connected with the outlet end of the first conical coil pipe, the other end of the second circulating pipeline is communicated with the outside, and the second communicating valve is arranged in the second circulating pipeline;
the third communicating valve is arranged on a pipeline connecting the circulating water tank and the inlet end of the first conical coil, the fourth communicating valve is arranged on a pipeline connecting the outlet end of the first conical coil and the circulating water tank, and the fifth communicating valve is arranged on a pipeline connecting the exhaust port of the washing tower and the inlet end of the second conical coil;
the first communicating valve, the second communicating valve, the third communicating valve and the fourth communicating valve are switched, and the heat exchange medium in the first conical coil is controlled to be switched; and switching the working state of the fifth communication valve to control the working state of the second conical coil.
2. The foam scrubber as recited in claim 1 wherein the first conical coil has a cone angle of 30 ° -75 ° and a pitch of 50-70 mm.
3. The foam scrubber according to any of claims 1 or 2, wherein the second conical coil has a cone angle of 30 ° to 75 ° and a pitch of 50 to 70 mm.
4. The foam scrubber as recited in claim 3 wherein the wash pipe employs a dual stage reverse spray.
CN201710445552.7A 2017-06-14 2017-06-14 Foam washer Active CN107029523B (en)

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CN107854934A (en) * 2017-12-22 2018-03-30 杭州博韵易环保科技有限公司 A kind of dual dust arrester for low-light resonance exhaust-gas treatment
CN107930325A (en) * 2017-12-22 2018-04-20 杭州博韵易环保科技有限公司 A kind of spraying dedusting device for low-light resonance exhaust-gas treatment
CN113457327B (en) * 2021-08-03 2022-10-18 河南环碧环保工程设备有限公司 A scrubbing tower for gaseous dust fall
CN114832603A (en) * 2022-04-18 2022-08-02 长沙环境保护职业技术学院 Device for energy conservation and emission reduction of ecological environment

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CN102716656A (en) * 2012-03-23 2012-10-10 北京东旭宏业科技有限公司 Smoke washing device
CN205850571U (en) * 2016-06-29 2017-01-04 大唐环境产业集团股份有限公司 A kind of flue gas SO3removing carries effect device
CN106433804A (en) * 2016-10-20 2017-02-22 内蒙古京能锡林煤化有限责任公司 Trapping method and trapping system for tar in coal gas

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